Conversion formula

The conversion factor from knots to feet per second is 1.6878098570997, which means that 1 knot is equal to 1.6878098570997 feet per second:

1 kt = 1.6878098570997 ft/s

To convert 128.5 knots into feet per second we have to multiply 128.5 by the conversion factor in order to get the velocity amount from knots to feet per second. We can also form a simple proportion to calculate the result:

1 kt → 1.6878098570997 ft/s

128.5 kt → V_(ft/s)

Solve the above proportion to obtain the velocity V in feet per second:

V_(ft/s) = 128.5 kt × 1.6878098570997 ft/s

V_(ft/s) = 216.88356663732 ft/s

The final result is:

128.5 kt → 216.88356663732 ft/s

We conclude that 128.5 knots is equivalent to 216.88356663732 feet per second:

128.5 knots = 216.88356663732 feet per second

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 foot per second is equal to 0.0046107688816841 × 128.5 knots.

Another way is saying that 128.5 knots is equal to 1 ÷ 0.0046107688816841 feet per second.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that one hundred twenty-eight point five knots is approximately two hundred sixteen point eight eight four feet per second:

128.5 kt ≅ 216.884 ft/s

An alternative is also that one foot per second is approximately zero point zero zero five times one hundred twenty-eight point five knots.

Conversion table

knots to feet per second chart

For quick reference purposes, below is the conversion table you can use to convert from knots to feet per second